Rhydderch () was a 10th-century bishop of Meneva (modern St. David's).
Most sources place his ministry between Ruelin and Elwyn,Hardy, T. Duffus. Fasti Ecclesiae Anglicanae; or, a Calendar of the Principal Ecclesiastical Dignitaries in England and Wales, and of the Chief Officers in the Universities of Oxford and Cambridge from the Earliest Times to the Year MDCCXV, Corrected and Continued to the Present Time, Vol. I, "St. David's". Oxford Univ. Press, 1854. Accessed 18 Feb 2013. but the Annals of Wales place him after MorfywAnnals of Wales (B text). p. 10. with his date of death under Phillimore's dating of the A text.Cf. Annales Cambriae (A text).
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